Light extraction member

A light extraction member, comprising:

• a light guide portion having a first main surface on a light output side and a second main surface opposite to the first main surface;
• a light output control layer arranged in a predetermined pattern over the first main surface of the light guide portion, the light output control layer being an applied layer or a printed layer;
• and
• a light extraction structure arranged on the side of the light output control layer opposite to the light guide portion, the light extraction structure being a light-diffusing layer, the light extraction structure comprising a plurality of convex portions extending away from the first main surface of the light guide portion,
• wherein two or more convex portions of the plurality of convex portions are between the light output control layer and the first main surface of the light guide portion and completely covered by the light output control layer in accordance with the predetermined pattern,
• wherein at least one convex portion of the plurality of convex portions is free from being covered by the light output control layer based on the predetermined pattern,
• wherein a refractive index n1 of the light guide portion and a refractive index n2 of the light output control layer satisfy a relationship of n1>n2,
• wherein the refractive index n2 of the light output control layer is from 1.01 to 1.30,
• wherein the light output control layer is formed of one or a plurality of constituent units each having a particle shape, the particle-shaped constituent units contain microporous particles each containing silicon, and the constituent units are chemically bonded to each other through a catalytic action, and
• wherein the microporous particles each contain a pulverized body of a gel-like silica compound.